Extensible incinerator gas scrubber system with standard ductwork

ABSTRACT

This invention relates to the abatement of air pollution resulting from the discharge of combustion products from refuse incinerators. The invention includes but is not limited to the apparatus of both recirculation-type tank-mounted ejector-venturi gas scrubber systems actuated by pressurized scrubbing liquid recirculated by an integral system pump, and drain-type tank-mounted ejectorventuri gas scrubber systems actuated by pressurized water supplied from a municipal water system or other outside source. Height-adjustable gas washer units provide an extensible foundation for a standard system of inlet, bypass and discharge ductwork wherein the furnace intake of the scrubber system may be easily installed in a sheltered position adjacent the refractory furnace ceiling of apartment house incinerators having different designs and furnace heights. This extensible arrangement eliminates the need and expense for individual custom-type fit-up and shop fabrication of scrubber system ductwork as commonly practiced by installers.

United States Patent 1191 Hull Apr. 2, 1974 [54] EXTENSIBLE INCINERATORGAS 810,825 3/1959 Great Britain 210/250 SCRUBBER SYSTEM WITH STANDARDDUCTWORK Primary Examiner-Robert L. Lindsay, Jr.

[76] Inventor: Francis R. Hull, 567 E. 26th St.,

Brooklyn. N.Y. ll 2lQ [57] ABSTRACT Filed: 9, 1973 This inventionrelates to the abatement of air pollution [21] APP[ No1339886 resultingfrom the discharge of combustion products from refuse 1nc1nerators. 'f lApplication Data The invention includes but is not limited to the [63]comm'uatlon'm'pa" of 45,0441 June apparatus of both recirculation-typetank-mounted 1970 Abandoned ejector-venturi gas scrubber systemsactuated by pressurized scrubbing liquid recirculated by an [52] US. Cl55gfi8is5o5lig9fgl53ls4i integral System pump and draimtype tankmoumedInt Cl B04! ejector-venturi gas scrubber systems actuated by Fieid 227228 pressurized l:vater supplied from a municipal water system or at eroutsl 0 source. 55/229, 314; 26l/DlG. 54; 248/[57 He1ght-ad ustablc gaswasher units provide an [56] References Cited extensible foundation fora standard system of inlet, UNTED STATES PATENTS bypass and dischargeductwork wherein the furnace intake of the scrubber system may be easilyinstalled 9001180 10/1908 l' 210/250 in a sheltered position adjacentthe refractory furnace l 2322; ceiling of apartment house incineratorshaving 2484277 10/1949 Fisher 54 different designs and furnace heights.This extensible 2 19831332 5/l96l vicordfiijlnuun. I: 261/010: 54eliminates the need and P for 3,1 17,760 1/1964 Dresbach et 3L...248/157 x mdlvldual yp P and p fabrlczftlon of 3,448,562 6 1969 Wisting26l/ DIG. s4 scrubber y em duc work s commonly practiced by FOREIGNPATENTS OR APPLICATIONS 5/1923 Germany 55/358 installers.

7 Claims, 16 Drawing Figures PATENTEDAPR 2 m4 3,800.51 1 sum 1 or sINVENTOR. Francis R. Hull WQMyt ATTORNEY PATENIEU APR 2 I974 SHEET 2 0F5 OOOOOOOOOJ- ATTORNEY w: n 5: 7 u 0 i n Nor mm 09 fl @w mw fi w om Q67SHEET 3 [IF 5 l POP INVENTOR. Francis R.Hull

mawyz.

' ATTORNEY PATENTED 21974 PATENTEDAPR 21914 21800.51 1

saw u or 5 INVENTOR. Francis R. HuH

W (ZZZJ Q ATTORNEY PAIENTED APR 2 I974 SHEEI 5 0F 5 @fi l mim l I I IllI I h: w 5 p l r Br I I I I mmw ND R3 N9 ,2 wmmwmw mm? mm? Vwr mm? hm?mm? Francis R.Hu I I INVENTOR.

ATTORNEY EXTENSIBLE INCINERATOR GAS SCRUBBER SYSTEM WITH STANDARDDUCTWORK The present invention is a continuation-in-part of my presentlypending application Ser. No. 45,044 entitled Extensible Incinerator GasScrubber Systems With Standard Ductwork and filed June 10, 1970 nowabandoned.

Widespread urban adoption of automatic and semiautomatic incinerator gaswasher systems for the abatement of air pollution has been seriouslyhampered by cost considerations. Incinerator gas scrubber units,together with their inlet, bypass and discharge duct branches arenormally made of stainless steel or other corrosion-resistant materialto retard corrosive attack caused by the effects of combustion processbyproducts. A standard gas washer unit is normally produced by themanufacturer in different sizes for various capacity ranges. Thesestandard gas washer units of fixed size are then installed to limitcombustion products emissions from non-standard masonry incineratorswhich have different designs, geometry and furnace heights. Thesenon-standard characteristics of existing incinerators as combined withthe fixed configuration of a common standard gas washer unit forces theinstaller to individually custom-fit and shop fabricate the scrubbersystem ductwork branches of each incinerator installation.

It is among the objects of the present invention to provide a wetscrubber system with extensible supports and integral standardpre-fabricated inlet and discharge ductwork which may be readilyinstalled into masonry penetrations at common inlet and discharge ductlocations of non-standard incinerator systems.

Another object is to provide an extensible scrubber unit configurationwith integral standard pre-fabricated inlet ductwork whose furnaceintake may easily be elevated to a sheltered position adjacent therefractory furnace ceiling of non-standard incinerators having differentfurnace ceiling. heights.

An additional object is to provide a wet scrubber system having astandard prefabricated discharge duct branch which may be installed intothe incinerator smoke flue masonry adjacent the incinerator room ceilingwith close installation clearances.

A further object is to provide a standard wet scrubber systemconfiguration of simple economy and functional efficiency which isadapted to operation by automatic or semi-automatic control devicescommon to the emission control arts.

Another object is to provide an ejector-venturi gas scrubber unit ofstandard manufacture whose gas handling capacity may be easily andsimply varied by the installation of alternate motive-nozzle assemblies.

As used herein:

the term wet scrubber or wet scrubber system shall relate to gas washerapparatus which removes particulate contaminants and condensable gasfractions from a contaminated gas stream by any method involvinginteraction between droplets of a scrubbing liquid and the contaminatedgas stream in a process which tends to saturate the cleaned gas streamwith the scrubbing liquid;

the term single-chamber incinerator shall refer to refuse burningapparatus which has a simple furnace that discharges combustion productsdirectly to an outlet flue;

the term multiple chamber incinerator shall refer to refuse burningapparatus whose furnace chamber discharges smoke and combustion gasesinto a settling chamber having multiple passes where coarse particulatematter is removed from the combusted gas stream by inertial separationwith directional change before the combustion gases are finallydischarged into the outlet flue of the incinerator,

the term emission control device shall refer to separating apparatuswhich limits the atmospheric discharge of particulate contaminants orcondensable gases from any combustion process by removing thesebyproducts from the combusted gas stream;

With the aforestated objects in view, together with others which willappear as the description proceeds, the invention resides in the novelconstruction, assemblage, and arrangement of parts which will bedescribed more fully in the following discussion, illustrated in thedrawings, and particularly pointed out in the claims.

In the drawings:

FIG. 1 is an isometric schematic drawing of a heightadjustablerecirculation-type tank-mounted ejector scrubber unit with attachedstandard scrubber inlet, bypass and discharge duct branches as assembledfor installation as the emission control system of an upgraded refuseincinerator.

FIG. 2 is a fragmentary rear corner view taken from the right end panelof the height-adjustable recirculation tank shown in FIG. 1 toillustrate the arrangement of adjustable support legs.

FIG. 3 is a fragmentary right corner view taken from the rear side panelof the height-adjustable recirculation tank shown in FIG. 1 toillustrate the arrangement of adjustable support legs.

FIG. 4 is a fragmentary sectional view taken across the right rearcorner of the height-adjustable recirculation tank shown in FIG. 1 toillustrate the arrangement of adjustable support legs.

FIG. 5 is a front elevation of a height-adjustable recirculation-typetank-mounted ejector scrubber system with attached inlet, bypass anddischarge duct branches.

FIG. 6 is a fragmentaryright end elevation of the wet scrubber systemshown in FIG. 5.

FIG. 7 is a fragmentary transverse section of the recirculation tankpump suction piping taken along line 1--1 of FIG. 6.

FIG. 8 is a side view of the submerged recirculation tank pump suctionheader taken along line 2-2 of FIG. 7.

FIG. 9 is an end view of the submerged recirculation tank pump suctionheader taken along line 66 of FIG. 8.

FIG. 10 is a front elevation of a height-adjustable drain-typetank-mounted ejector scrubber system with attached inlet, bypass anddischarge duct sections.

FIG. 11 is a plan view of the drain-type tank-mounted ejector scrubbersystem taken along line 33 of FIG. 10 showing the system superimposed asinstalled onto the horizontal furnace section of a single-chamberincinerator.

FIG. 12 is a sectional elevation taken along line 4-4 of FIG. 11 showingthe drain-type tank-mounted ejector scrubber system of FIG. as installedto upgrade a single-chamber incinerator.

FIG. 13 is an exterior end view of the drain-type scrubber systemdischarge ductwork taken along line 5-5 of FIG. 11.

FIG. 14 is a fragmentary longitudinal section of an ejector-venturi gasscrubber unit which mounts a detachable motive-nozzle assembly.

FIG. 15 is a fragmentary section of the ejectorventuri gas scrubber unitof FIG. 14 which mounts an alternate detachable motive-nozzle assemblyof smaller size.

FIG. 16 is a fragmentary section of the ejectorvent-uri gas scrubberunit of FIG. 14 which mounts a second alternate detachable motive-nozzleassembly of smaller size.

FIGS. 14 inclusive of the drawings illustrate the apparatus of aheight-adjustable recirculation-type tankmounted ejector scrubber systemwith integral inlet, bypass and discharge duct branches in an assembledconfiguration as typically installed to upgrade a singlechamberincinerator.

In FIG. 1, the numeral 13 designates a sheet metal recirculation tankhaving the gross external shape of a truncated right triangular wedgewith a small rectangular prism cut transversely from its right baseangle. Recirculation tank 13 contains a scrubbing liquid (such as water)which is suppled by a pump to spray nozzles for the gas scrubbingprocess, and then largely recovered from the clean gas stream forrecirculation and reuse. Recirculation tank 13 is supported at thecorners thereof by adjustable support legs which permit the tank to beinstalled at a convenient height above the floor at a particularlocation. When installed at the most appropriate height for a particularlocation, tank 13 serves as the extensible foundation for the system ofstandard pre-fabricated inlet, bypass and discharge ductwork upon whicheconomy of installation so greatly depends.

A typical adjustable support leg arrangement as installed at the rightrear corner of recirculation tank 13 is shown in FIGS. 2, 3 and 4.Adjustable perforated angle-iron support leg 14 is secured by two bolts16 and nuts 17 to companion perforated angle-iron stringer 15.Perforated angle-iron stringer 15 is secured by welding or other meansto right end panel 39 adjacent rear panel 40 of tank 13. The verticalposition of each support leg 14 may be easily changed by removing bolts16, and then re-bolting the legs in a new positon.

During normal operations, a small continuous supply of make-up waterenters tank 13 through supply line 22 and solenoid valve 23 (FIG. 1). Asmall continuous discharge of scrubbing liquid also leaves tank 13 fromoverflow branch 18 and is discharged into the building drainage systemafter flowing through drain header 19. The minor discharge of scrubbingwater from tank 13 enters overflow branch 18 through an internal pipewhich is fixed to control tank water level. The overflow processcontinuously drains off floating contaminants which are removed from thecombustion gases during the scrubbing process. Sediment contaminantsremoved from incinerator gases by the scrubbing process settle into thebottom of tank 13, and may be released from the tank through drain lineinto drain header 19 by opening drain valve 21.

Tank water is recirculated during the scrubbing process by pump 28,which is driven by motor 29 and attached thereto by annular bracketmember 30. Closecoupled pump unit 28-30 is mounted on shelf bracket 37,which is supported by pin connections and angle brace members 38 securedto the left-hand tank support leg assemblies. Suction flow proceeds fromtank 13 into suction line 24, through valve 25, line strainer 26,flexible connection 27 and on into the suction of pump 28. Pressurizedscrubbing water discharged by pump 28 flows through nozzle supply line31, flexible connection 32 and past protective cut-out flow switch 33before entering the body of ejector-venturi gas scrubber 34.Ejector-venturi gas scrubber unit 34 is common to the gas scrubber art.

During scrubbing operations, hot contaminated combustion gases entercylindrical mesh intake basket 43, which would normally be made ofcorrosion-resistant metal. The discharge end of large-mesh intake basket43 is connected to the inlet end of enlarged duct section 44, shown asinstalled to penetrate a section of the incinerator sidewall. Theincinerator sidewall is typically composed of high-temperaturerefractory 45 and outside masonry material 47 separated by insulatingair space 46. As shown by the exterior arrows, hot combustion gases mayenter cylindrical mesh intake basket 43 from all directions through thefree flow spaces of the large mesh. The large mesh intake basketprevents the random entry of large uncombusted or partly combustedmaterial into the intake ductwork of the scrubber system.

I-lot combustion gases flow from the furnace through cylindrical meshintake basket 43 into enlarged inlet duct section 44, through concentricreducer section 48 and into regular scrubber inlet duct section 49.Scrubber inlet duct section 49 is connected to concentric reducersection 48 at the inlet end, and provides outlet flange 50 at itsdischarge end. An adjustable damper 51 is provided in inlet duct section49 by which the flow of furnace gases through the ductwork may beregulated, thereby controlling the furnace draft in a throttlingprocess. Scrubber inlet duct section 49 also includes a crossoverconnection with scrubber bypass duct branch 65 upstream of adjustabledamper 51 as shown.

Outlet flange 50 of inlet duct section 49 and inlet flange 36 of ejectorventuri gas scrubber 34 are connected together. Ejector-venturi gasscrubber 34 is connected to the top of recirculation tank 13 throughdischarge flange member 35 by bolting or other means. Internal spraynozzles within ejector-venturi gas scrubber 34 are suppled withpressurized scrubbing water from pump 28. During the scrubbing process,fine scrubbing water spray droplets entrain particulate contaminantsfrom the combusted gas stream by impingement capture in the narrowthroat section of the venturi scrubber unit. Condensable gas fractionsmay also be caused to condense from the dirty gas stream by the coolingattendant to the scrubbing process.

Separated particulate contaminants and condensed gas fractions areincluded in the liquid discharge of ejector-venturi scrubber unit 34.The separated contaminants with the liquid phase together with thecleaned combusted gas stream are discharged from the venturi scrubberinto an internal separating element housed within tank 13. Thecontaminated liquid and the cleaned combustion gas streams are dividedby the internal separating element, and the liquid stream with itscontaminants falls into the tank. The cleaned combusted gas stream flowsabove the scrubbing water surface within recirculation tank 13, andflows toward the discharge outlet thereof.

It should be noted that gas seal end panel 41 extends from the top tankpanel through the scrubbing water surface within tank 13. Thisarrangement prevents the escape of cleaned combustion gases, andchannels their flow into the available discharge outlet of the tank. Itshould also be noted that, as shown at 42 the scrubbing water surface isexposed at the upper righthand end of the recirculation tank. Floatablecontaminants enter the overflow piping at this location. This exposedscrubbing water surface 42 may also be used to house a float switchwhich controls the admission of make-up water into the tank.

The cleaned gas stream leaves recirculation tank 13 and flows intorectangular discharge duct section 52 through duct inlet flange 53, andon into long-radius duct turn 54. The cleaned gas stream then flowsthrough horizontal discharge duct header section 55, which houses manualdamper assembly 56 and provides a connection with bypass duct section 65as shown. The discharge gas stream next flows from horizontal ductheader section 55 into vertically disposed long-radius duct turn 57 andon into variable-height vertical duct section 58. The discharge gasstream next flows from variable-height vertical duct section 58 intovertical-to-horizontal short-radius duct turn 59 and on intovariable-width horizontal duct section 60 into horizontally-disposedlong-radius duct turn 61 and on into variable-depth horizontal ductsection 62, from which flow proceeds into vertically-disposed gas flueoutlet duct 63 for further discharge into the incinerator chimney flue.Elongate gas flue outlet duct 63 is normally installed within the gasflue in a recessed position flush with adjacent refractory lining of thechimney, and provides deflecting bars 64 across the discharge outletthereof.

Bypass duct section 65 houses bypass damper assembly 66, and provides across-over connection between scrubber inlet ductwork 43-44 and 48-49and scrubber discharge ductwork 55-63. Opening of bypass damper assembly66 and closing off inlet modulating damper assembly 51 would permitfurnace gases to flow from the incinerator into its chimney outlet duct63 past the entire gas scrubber assembly 13-42 and around theincinerator gas flue refuse charging gate (normally closed).

Bypass duct section 65 with bypass damper assembly 66 may also bearranged in a different manner. Bypass duct section 65 may be providedwith an individual inlet from the incinerator and have no directconnection with scrubber inlet ductwork 43-44 and 48-49. In thisvariation, furnace gases would be bypassed from the incinerator directlyinto discharge ductwork 55 and 57-63 inclusive, and discharged into theincinerator gas flue above the refuse charging gate (normally closed).This bypass arrangement would function similarly to the bypassarrangement in the embodiment of FIG. 1, but may be more advantageous inupgrading incinerator installations with peculiar arrangement or closeclearances.

It should be noted that the inlet, bypass and discharge ductworksections shown in the embodiment of FIG. 1 may be of standardmanufacture, excepting for variable height duct section 58,variable-width duct section 60 and variable-depth duct section 62.Pre-fabricated inlet ductwork would include elements 43-44 and 48-50,together with ejector-venturi gas scrubber assembly 33-36.Pre-fabricated discharge ductwork would include elements 52-57, 59, 61and 63-64. Prefabricated bypass ductwork would include elements 65-66.This arrangement permits the entire recirculation-type ejector-venturigas scrubber system having elements 13-44, 48-57, 59, 61 and 63-64 to bemanufactured and assembled at a central location. Variablelengthdischarge duct sections 58, 60 and 62 can be easily cut and fitted atthe job site by the installer. It is evident that the extensiblescrubber system of FIG. 1 can be easily installed with its intake 43elevated to a sheltered position adjacent the furnace ceiling inincinerators having different design and furnace heights, and therebyeliminate the considerable expense of individual fit-up and custom-typeshop fabrication of scrubber system ductwork as now practiced in theart.

The embodiment of FIGS. 5, 6, 7, 8 and 9 discloses elements of arecirculation-type ejector-venturi gas scrubber system in greaterdetail, but omitting certain inlet and discharge duct sections. Therecirculationtype scrubber system of FIGS. 5, 6, 7, 8 and 9 functionssimilarly to the scrubber system of FIGS. 1, 2, 3 and 4.

In FIGS. 5 and 6, the recirculation tank includes front side panel 67,top panel 68, inclined bottom panel 69, rear side panel 70, right endpanel 71, left end panel 72, gas seal end panel 73 and watertightservice and acess cover 112 as elements thereof. Recirculation tank67-73 is supported at each corner by an adjustable support leg 74, whichis pinned to its adjacent companion fixed perforated angle-iron stringer75 in the manner previously described. The bottom panel 69 ofrecirculation tank 67-73 slopes towards drain outlets provided byopposite welded couplings 80 to facilitate discharge of sedimentcontaminants by draining.

Tank water level is maintained for scrubbing operations by the admissionof a small water flow from outside make-up supply line 109. Make-upsupply line 109 includes solenoid valve 110 and orifice union 111.

When solenoid valve 1 10 is open, a small flow of makeup water isdischarged from the regulating orifice union 111 into the tank. Thissmall flow of make-up water causes a surface overflow to carry offfloating contaminants into overflow drain branch 76-79 inclusive.Overflow drain branch 76-79 includes submerged elbow 77 and connectingnipple 76, submerged elbow 77 being welded to the inside of right endpanel 71 to enclose a perforation therethrough. Overflow drain branch76-79 includes exterior elbow 78 and pipe member 79, exterior elbow 78being connected to submerged elbow 77 through the perforation in rightend panel 71 by a close pipe nipple or other suitable means. Thesubmerged elbow-and-nipple assembly 76-77 is fixed within the tank topermit an even overflow of surface drainage from recirculation tank67-73.

Recirculation tank 67-73 may be emptied by tank drain branch 82-83. Tankdrain branch 82-83 may be arranged on either side of recirculation tank67-73 as convenient by connection to either of tank drain couplings 80,with the unused coupling 80 being closed off by pipe plug 81. Tank draincouplings 80 are each welded to the exterior of their respective frontand rear side panels to envelop a drain hole in the lower cornerthereof. Tank drain branch 82-83 includes common pipe-and-elbow fittingsand drain valve 83. Tank drain branch 82-83 combines with overflow drainbranch 76-79 by means of tee 84 to discharge drainage into drain header85, and thence into the building sewage system.

In FIG. 7 is shown a fragmentary transverse sectional view of submergedrecirculation tank suction piping taken along line l1 of FIG. 6.Perforated suction manifold pipe member 86 is mounted transversely belowthe recirculation tank water line, and secured by circumferential weldsat the ends thereof to the inside tank surfaces of front side panel 67and rear side panel 70. Front side panel 67 and rear side panel 70 havesimilar holes to match the inside flow area of suction manifold pipe 86which are enveloped and sealed by the circumferential weldments.Exterior suction manifold couplings 87 are welded circumferentially tothe exterior surfaces of front and rear side panels 67 and 70respectively, opposite the ends of suction manifold pipe 86 as shown.One exterior suction manifold coupling 87 may be connected to pumpsuction piping as convenient to the installer, while the unused suctionmanifold coupling 87 is closed off by means of a common pipe plug 89.

Pump suction piping is connected as convenient to either of the exteriorsuction manifold couplings 87 as shown in FIG. 7. Tee member 88 isconnected to exterior manifold coupling 87 by a common pipe nipple orother suitable means. The outside run of tee member 88 is closed by acommon pipe plug 89, while the side outlet is connected to suction pipemember 90. The pump suction line includes piping 90, cut-out valve 91,strainer 93, male-and-female pip unions 92 and 94, flexible connection95 and other necessary fittings common to the piping arts.

Recirculated scrubbing water enters the perforations of suction manifoldpipe 86 in an even pattern as shown by the exterior arrows. Scrubbingwater flows directly into the pump suction line form suction manifoldpipe 86, and on into the suction 96 of the actuating centrifugal pump97. Perforations in the sides of suction manifold pipe 86 may bedesigned and distributed in any suitable pattern to promote developmentof a controlled state of turbulent mixing within the recirculation tank.This controlled state of turbulent mixing is intended to inhibit theseparation of floatable contominants from the scrubbing water by keepingthem in suspension within major regions of the tank, and to promote theseparation of floatable contaminants in the calm region of the exposedscrubbing water sruface 113 adjacent the submerged overflow pipe section76.

Centrifugal-type recirculation pump 97 is mounted on a shelf bracketmember 98, the latter being secured by pin connections and angle bracemembers 99 to the left-hand tank support leg assemblies which includeadjustable support legs 74.

Pressurized scrubbing water is discharged by recirculation pump 97 intoejector-scrubber nozzle supply piping 100. Nozzle supply piping 100provides for inclusion of flexible connector 101 and protective flowswitch 102, together with other fittings common to the piping arts.

Ejector-venturi gas scrubber unit 103 is mounted on the top ofrecirculation tank 67-73 by connectors through outlet flange 105. Hotdirty combustion gases enter ejector-venturi scrubber unit 103 throughscrubber inlet flange 104, while pressurized scrubbing water,

supplied by pump 97 through nozzle supply piping 100, enters at the topof the scrubber unit. The front housing plate of ejector-venturiscrubber unit 103 has been partly removed in FIG. 5 to expose theinternal spray nozzle. Scrubbed combustion gases and the contaminatedliquid stream are discharged into recirculation tank 67-73 throughoutlet flange member 105.

Referring still to FIG. 5, the contaminated scrubbing liquid andscrubbed gas streams are discharged from ejector-venturi scrubber unit103 through inertial separating element 106. Baffle-type inertialseparating element 106 is internally mounted within recirculation tank67-73 adjacent the discharge outlet of ejectorventuri scrubber unit 103.The separated contaminated liquid and scrubbed gas streams aredischarged above the scrubbing water surface within the tank, asindicated by the dotted lines in FIG. 5. The contaminated scrubbingliquid stream is discharged onto the internal surface of left-end panel72, and falls into the water body below. The scrubbed gas stream flowsabove the scrubbing water surface towards the tank discharge outletadjacent gas seal end panel 73, as shownby the dotted arrow.

Particulate contaminants removed from the scrubbed gas stream fall as asediment through the scrubbing liquid onto the inclined bottom panel andmigrates towards the lower righthand tank edge adjacent drain couplings(FIG. 6). Particulate sedimentary material may be discharged as drainageby opening drain valve 83 at periodic intervals during maintenancecleaning. During maintenance cleaning, tank access cover 112 (FIG. 5)may be removed to permit washing out of the tank by a hand-held waterhose.

Light floatable contaminants removed from the scrubbed gas stream may beheld in substantial suspension within the distributed turbulent mixingregion of the scrubbing liquid caused by the patten of perforations insuction manifold pipe member 86. The light floatable contaminants willbe allowed to separate out from suspensionin the scrubbing liquid byrising to the exposed scrubbing water surface 1 13 in the calm regionadjacent overflow pipe member 76 at the upper righthand edge of therecirculation tank.

A small continuous supply of make-up water from an outside source entersthe recirculation tank through water supply line 109, solenoid valve 110and orifice union 1 11. When the scrubber system is electricallyactuated, solenoid valve 110 opens. The small orifice of orifice union111 admits make-up water at rates of about 2-3 gpm which causes acontinuous surface overflow into overflow drain branch 76-79 inclusive.The continuous overflow carries off floatable contaminants separatedfrom the combustion gases by the wet scrubbing process.

Scrubbed and cleaned combustion gases are discharged from recirculationtank 67-73 into rectangular discharge duct 114 through duct entranceflange 115, which is secured to the discharge opening of tank 67-73 byconnectors common to the fastening arts. The scrubbed combustion gasesnext flow into vertically-disposed long radius duct turn 116 fromrectangular duct section 114, and flow on into horizontallydisposeddischarge duct header section 117. Horizontally-disposed discharge ductheader section 117 houses manual damper assembly 118.

Bypass duct section 119 with bypass damper assembly 120 (FIG. 5) isdisposed between the inlet duct and discharge duct sections upstream ofthe modulating inlet damper and downstream of the manual dischargedamper in the same manner as illustrated in connection with FIG. 1.Certain inlet ductwork and discharge ductwork sections have been omittedfor brevity and convenience in FIGS. and 6, but may be similarlyarranged as in the overall pattern of inlet and discharge ductwork shownin FIG. 1.

The modulating inlet damper assembly and bypass damper assembly 120 ofthe recirculation-type scrubber system disclosed in FIG. 5 wouldnormally be positioned automatically by electrical operators which arepart of the scrubber control system. These common devices are not shownand described for reasons of brevity, since they are not part of theapplicants contribution to the art.

Ejector-venturi scrubber unit 103 and inertial separating element 106are already common to the gas scrubbing arts. These units are fabricatedand distributed as single items of equipment by the manufacturer, andare normally custom-installed as part of an emission control systemwhose overall design and configuration varies in accordance withcustomer requirements. These component elements have not been assembledand distributed as parts ofa complete recirculation-type emissioncontrols system such as disclosed by the applicant. This completeemission controls system includes recirculation tank with adjustablesupport legs, integral fluid pump, ejector-venturi gas scrubber unit,baffle-type inertial separating element, together with pre-manufacturedinlet, bypass and discharge ductwork integral to the system.

The illustrative embodiment of FIGS. 10, 11, 12 and 13 discloseselements of a drain-type tank-mounted ejector gas scrubber system whichare actuated by pressurized water supplied from a municipal water systemor other outside source. The drain-type scrubber system disclosed inFIGS. 10, 11, 12 and 13 has a general function similar to that ofrecirculation-type ejector gas scrubber systems excepting that thescrubbing water supplied by the outside source is continually dischargedas drainage without re-use.

In FIGS. 10, l1 and 12 the drain tank includes front side panel 121, toppanel 122, inclined bottom panel 123, rear side panel 124, right endpanel 125, left end panel 126, watertight service port 127 andwatertight access cover 128 as elements thereof. Drain tank 121-128 issupported at each corner by an adjustable support leg 129 which ispinned to the most adjacent fixed perforated angle-iron stringer 130.The fixed perforated angle-iron stringer 130 for each adjustable supportleg 129 is secured to the outer tank shell by welding or other suitablemeans. Bottom panel member 123 is inclined towards the tank drain outletenveloped by welded coupling 131 to facilitate drainage.

FIG. is a front elevation of the drain-type tankmounted scrubber systemwith its ductwork shown in typical installed position. FIG. 11 is a planview of the drain-type scrubber system superimposed as installed ontothe horizontal section of a single-chamber incinerator in a stylepracticed by those skilled in the incinerator art. FIG. 12 is asectional elevation showing the drain-type scrubber system superimposedon the vertical section of a single-chamber incinerator.

During scrubbing operations, a continuous supply of pressurizedscrubbing water from an outside source is admitted into ejector scrubbernozzle supply line 141 through solenoid valve 142 when the solenoidvalve is acutated by the electrical control system. Hot contaminatedcombustion gases enter the scrubber intake ductwork from the furnacethrough cylindrical mesh intake basket 133. Scrubbed and cleanedcombustion gases leave the scrubber system through discharge duct system146-157 (FIG. 13). The contaminated scrubbing liquid is discharged towaste through drain line 132 (FIGS. 10 and 11).

The upgraded single-chamber incinerator -176 of FIG. 12 has a furnacespace 160 supplied with combustible refuse from combinationcharging-and-gasflue space 161. Combination charging-and-gas-flue space161 normally extends from connection with the incinerator furnace at itslower end to its upper end above the building roof, and the flue designprovides hopper doors at the various floor levels of the buidlingthrough which refuse may be emptied into the flue. The refuse falls ontoslidably disposed charging gate 162, which may be cyclically retractedout of the viewing plane of FIG. 12 by the incinerator controlapparatus. When the stored refuse is released from the flue to fall ontothe furnace grates 168 of upgraded singlechamber incinerator 160-176, itis normally ignited by an automatic gas burner actuated from theincinerator control system.

The incinerator is typically constructed with an outer wall of commonmasonry 165 with an inner heatresistant refractory lining 163 separatedby an insulating air space 164. The roof of the furnace chamber 160 istypically comprised of an inner heat-resistant refractory tile slab 166covered by an outer layer of insulating refractory masonry 167. Both thefurnace chamber 160 and the combination charging-and-gas flue space 161may be lined with inner heat-resistant refractory lining 163 surroundedby exterior common masonry 165 with the separating air space 164. Theupgraded singlechamber incinerator 160-176 provides original horizontalrefractory hearth 169, sloping refractory hearth alterations 170,original firing door 171 with air port, ash pit space 172 below furnacegrates 168, refractory lining of ash pit space 173, ash pit cleanoutdoor 174 with adjustable register, foundation masonry 175 of furnacehearths 169 and firing space 176 between firing door 171 and furnacegrates 168. Underfire air is admitted under furnace grates 168 throughthe register of ash pit door 174 to support the combustion process.

Hot contaminated combustion gases from furnace chamber 160 are drawninto cylindrical mesh intake basket 133 by ejector-venturi gas scrubber137 and proceed into inlet duct 134 past closed bypass duct branch 158,pass open modulating damper assembly I 135, and flow thence throughinlet-duct outlet flange 136. Inlet duct 134 with attached mesh intakebasket 133 extends through the incinerator sidewall 163-165 adjacentrefractory tile roof slab 166 as shown. Inlet duct outlet flange 136 isconnected by suitable means to inlet flange 138 of ejector-venturi gasscrubber assembly 137-140 inclusive.

Ejector-venturi gas scrubber assembly 137-140 includes ejector-venturibody shell 137 with its internal spray nozzle, gas inlet flange 138,discharge flange 139 and watertight nozzle-service port 140. Pressurizedwater from a municipal water system or other outside source is suppliedto the internal spray nozzle of the ejector scrubber through nozzlesupply line 141 after solenoid valve 142 is electrically opened. A finespray of high-velocity water droplets is discharged across the ejectorthroat to entrain the dirty gas stream. The spray droplets also captureparticulates by wetted impingement, and causes the liquid condensationof condensable gas fractions from the combusted gas stream by thecooling process.

The scrubbed combustion gases and the contaminated scrubbing liquidstream are discharged into drain tank 121-128 through baffle-typeinertial separating element 143 (FIG. which is internally mounted withindrain tank 121-128 adjacent the discharge of ejector-venturi gasscrubber assembly 137-140. The separated contaminated liquid andscrubbed gas streams are discharged above the drainage water surface, asindicated by the dotted lines in FIG. 10. The contaminated liquid streamis discharged onto the internal surface of left-end tank panel 126, andfalls into the temporary drainage water body 145 below. The scrubbed gasstream flows above the temporary drainage water surface in gas flowspace 144 towards the tank discharge outlet adjacent the upperright-hand edge as shown by the dotted arrows.

Particulate contaminants and condensed gas fractions removed from thecombustion gas stream falls into temporary drainage water body 145.Temporary drainage water body 145 rises to that height necessary toovercome friction in the drain system, and maintains this height duringsteady state operations while being continuously drained off. Temporarydrainage water body 145 provides an efficient water seal which preventsthe substantial escape of scrubbed combustion gases through drain line132.

Scrubbed combustion gases are discharged from drain tank 121-128 intorectangular discharge duct 146 through duct entrance flange 147. Ductentrance flange 147 is suitably secured to the discharge outlet of draintank 121-128. The scrubbed combustion gases next flow intovertically-disposed long-radius duct turn 148, and thence throughhorizontally-disposed discharge duct header section 149.Horizontally-disposed discharge duct header section 149 houses manualdamper assembly 150, and provides connection with bypass duct section158. The discharge gas stream flows past closed bypass duct section 158,thence into vertically-disposed long-radius duct turn 151, and on intovariable-height vertical duct section 152. The discharge gas stream nextpasses from variable-height vertical duct section 152 intovertical-to-horizontal shortradius duct turn 153, and on into closelyconnected horizontally-disposed long-radius duct turn 154. The dischargegas stream proceeds from horizontallydisposed long-radius duct turn 154into variable-depth horizontal duct section 155, from which the scrubbedgases proceed into vertically-disposed gas flue outlet duct 156 forfurther discharge into charging-and-gas flue 161. Elongate gas flueoutlet duct 156 is normally installed within gas flue 161 in a recessedflush with adjacent refractory lining 163, and provides deflecting bars157 across the discharge outlet thereof to prevent entry of refuse.

Bypass duct section 158 houses bypass damper assembly 159, and providesa cross-over connection between scrubber inlet ductwork 133-136 andscrubber discharge ductwork 149-156. When bypass damper assembly 159 isopened and modulating damper assembly 135 is closed, furnace gases mayflow directly from the furnace into the chimney flue around both the gasscrubber and refuse charging gate 162 (normally closed). It should alsobe noted that the bypass duct section 158 with damper assembly 159 wouldnormally be open when the scrubber system is shut down, while themodulating inlet damper assembly would be closed. The automaticoperation of modulating inlet damper assembly 135 and bypass damperassembly 159 may be actuated from the scrubber controls system, andeffected by electrical operators common to the controls arts.

Ejector-venturi unit 137 and inertial separating element 143 are alreadycommon to the gas scrubber arts. So far as applicant is aware, thesecomponent elements have not been assembled and distributed as parts of acomplete drain-type emission controls system such as disclosed by theapplicant. This complete emission controls system includes drain tankwith adjustable support legs, ejector-venturi gas scrubber unit,baffle-type inertial separating element, together with premanufacturedinlet, bypass and discharge ductwork integral to the system.

FIG. 14 is a fragmentary longitudinal section of a variable capacitydrain-type ejector-venturi unit 177-182 inclusive, which is constructedof sheet metal and copied from an actual unpublished design. In FIG. 14the flow of incinerator gases is induced by a highvelocity jet spraydischarged from detachable motivenozzle assembly 183-186 inclusive,which is supplied with pressurized scrubbing water from supply pipe 187.FIG. 15 is a fragmentary section of ejector-venturi unit 177-182inclusive (FIG. 14) which mounts an alternate detachable motive-nozzleassembly of smaller size. FIG. 16 is a fragmentary section ofejector-venturi unit 177-182 inclusive (FIG. 14) which mounts a secondalternate motive-nozzle assembly of smaller size. Any of themotive-nozzle assemblies 183-186 inclusive (FIG. 14), 189-192 inclusive(FIG. 15), or 194-197 inclusive (FIG. 16) may be alternately installedin ejector-venturi unit 177-182 inclusive to vary gas handling capacityof the scrubber unit by altering the motive-jet water supply rate to theejector-venturi.

In FIG. 14 ejector-venturi unit 177-182 inclusive is comprised ofannular receiving chamber 177, annular throat section 178, annulardiffuser discharge section 179, flanged gas inlet duct connection 180,flanged annular inspection and service port 181, and flanged annularnozzle-assembly mounting spud 182. Nozzle assembly 183-186 inclusive iscomprised of annular disc member 183 having pipe coupling 184 centeredtherewithin, close pipe nipple 185 and converging nozzle member 186, allof which are suitably secured together by means common to the plumbingart. The outer edge of annular disc member 183 seats against thematching flange of annular nozzle-assembly mounting spud 182. Nozzleassembly 183-186 is secured in operating position by detachable annularrim clamp 188 (shown in section), which is common in the fastening art.After nozzle assembly 183-186 has been securely mounted ontoejector-venturi unit 177-182 by closure of annular rim clamp 188, watersupply pipe 187 would normally be connected to pipe coupling 184 tocomplete the installation work.

Nozzle supply assmbly 189-192 inclusive (FIG. 15) is comprised ofannular disc member 189 having pipe coupling 190 centered therewithin,pipe nipple 191 and converging nozzle member 192, all of which aresuitable secured together by means common to the plumbing art. The outeredge of annular disc member 189 seats against the matching flange onannular nozzleassembly mounting spud 182. Nozzle assembly 189-192inclusive may be securely mounted onto ejector-venturi unit 177-182 byclosure of the common detachable annular rim clamp 188 (shown insection). Nozzle assembly 189-192 inclusive is of smaller capacity thannozzle assembly 183-186 inclusive (FIG. 14), and may be alternatelysubstituted therefor.

Nozzle supply assembly 194-197 inclusive (FIG. 16) is comprised ofannular disc member 194 having pipe coupling 195 centered therewithin,pipe nipple 196 and converging nozzle member 197, all of which aresuitably secured together by means common to the plumbing art. The outeredge of annular disc member 194 seats against the matching flange onannular nozzleassembly mounting spud 182. Nozzle assembly 194-197inclusive may be securely mounted onto ejector-venturi unit 177-182 byclosure of the common detachable annular rim clamp 188 (shown insection). Nozzle assembly 194-197 inclusive is of smaller capacity thaneither of nozzle assembly 183-186 inclusive (FIG. 14) or nozzle assembly189-192 (FIG. 15), and may be alternately substituted for either as themotivenozzle assembly of ejector-venturi unit 177-182 inclusive.

The alternate motive nozzle assemblies disclosed in FIGS. 14, 15 and 16are each designed in cognizance with known spreading properties of afluid jet, so the theoretical spread of each liquid jet will equal thediameter of ejector-venturi throat 178 within the length of the throatsection. The approximate outline of the theoretical spread of eachliquid jet is indicated in phantom in each of FIGS. 14, 15 and 16. Thatmotive-jet spread should equal ejector-venturi throat diameter withinthe throat length is known by experiment to be necessary for achievingusefulness in the design of ejectors. It is also necessary in the designof interchangeable motive nozzle assemblies for a common ejectorventuriunit that the nozzle assemblies have common spreading characteristics ifuseful gas handling capacities at different motive-fluid flow rates areto be realized.

The advantages of the invention for ease of manufacture and convenienceof installation can now be emphasized. Drain-type tank-mountedejector-venturi gas scrubber system 121-157 (FIG. 11) can bemanufactured and assembled almost entirely of identical components for agiven gas handling capacity range excepting for the job-site fit-up ofvariable-height, variable-width and variable-depth discharge ductsections. Similarly recirculation-type tank-mounted ejectorventuri gasscrubber system 67-120 with inlet and discharge ductwork similar to thatof FIG. 1 can be manufactured and assembled almost entirely of identicalcomponents for a given gas handling capacity range excepting for thejob-site fit-up of variable-height, variable-width and variable-depthdischarge duct sections. The vertically-disposed ejector-venturi gasscrubber unit of each scrubber system is an integral part of its inletductwork, and supports its horizontally-disposed intake duct branch atthe approximate height of the refractory furnace ceiling. Either ofpre-manufactured recirculation-type scrubber system 67-120 (FIG. 7) ordrain-type scrubber system 121-157 may be conveniently installed withthe furnace intake elevated to the correct height adjacent therefractory furnace roof without serious regard for variations inincinerator geometry. The adjustable support legs of either scrubbersystem are extended and fixed at the correct length for the particularincinerator installation, and the scrubber system installation mayproceed with facility. Either scrubber system may be installed witheither front or rear tank sides adjacent the incinerator as convenient,and the fit-up of standard duct sections proceeds with dispatch inaccordance with the arrangements of a particular incinerator.

The teachings of the invention with respect to extensible support legsand pre-manufactured standard ductwork may also be applied to wetscrubber systems of other design. In some of these designs the principalsystem actuator may be an induced draft type of fan, as applied to theincinerator combustion system. In other designs, the system may includeboth an induced draft fan and a jet spray pumping system as principalactuators. In either of these applications, the wet scrubber systemwould include the combination of extensible support legs mounted on thescrubber frame or shell together with a system of standardpre-manufactured inlet, bypass and discharge ductwork sections madepossible by the adjustable height feature of the scrubber body.

While I have shown and described certain specific embodiments of thepresent invention, it will be readily understood by those skilled in theart that I do not wish to be limited exactly thereto, since variousmodifications may be made without departing from the scope of theinvention as defined in the appended claims.

I claim:

1. Combined air pollution control apparatus for refuse incineratorshaving different ceiling heights and geometry comprising aheight-adjustable wet gas scrubber system having in combination: anelongated plenum comprising a horizontal settling chamber having fluidpassageways therein for horizontal transit with flow reversal of cleanedcombustion gases and providing a receptacle for separated scrubbingwater; said horizontal settling chamber providing inlet and outletopenings thereon for connection with inlet and outlet gas conduits;extensible support legs having alternate connecting elements andconnections with said horizontal settling chamber whereby saidextensible support members may be disposed in alternate positions tosupport the said settling chamber an adjustable distance with respect tothe floor; a fluid pump comprising an ejector-venturi gas scrubber unithaving an integral motive nozzle disposed to impel the flow ofcombustion gases through said extensible wet gas scrubber system bymeans of a high-velocity motive-jet of scrubbing water; saidejector-venturi gas scrubber unit substantially supported by connectionwith said horizontal settling chamber and disposed to dischargedownwardly thereinto; a baffle-type separating element disposed withinsaid horizontal settling chamber adjacent the outlet of saidejector-venturi gas scrubber unit to discharge separated liquid andgaseous streams horizontally therefrom; means for supplying pressurizedscrubbing water to the motive nozzle of said ejector-venturi fluid pump;valve means for selectively admitting pressurized scrubbing water intothe water supply conduit of said motive nozzle; a drainage conduitcommunicating with a liquid waste outlet of said horizontal settlingchamber and disposed to discharge separated liquids therefrom;

a gas inlet conduit disposed to communicate between the gas outlet of arefuse incinerator and the inlet of said ejector-venturi gas scrubberunit, the said gas inlet conduit substantially supported by connectionwith said ejector-venturi fluid pump; and a gas discharge conduitdisposed for communication between the gas outlet of said horizontalsettling chamber and the discharge flue of a refuse incinerator, saidgas discharge conduit substantially supported by connection with saidsettling chamber; whereby the said horizontal settling chamber and itsextensible support members comprise a height-adjustable foundation forthe substantial support of the said ejector-venturi gas scrubber unitand the said inlet and outlet gas handling conduit.

2. The extensible wet gas scrubber system of claim 1 wherein valve meansare disposed in drainage conduit of said horizontal settling chamber;the lower section of said horizontal settling chamber being disposed toprovide a storage reservoir for recirculated scrubbing liquid; a liquidpump; pump suction conduit communicating between the liquid reservoir ofsaid horizontal settling chamber and the suction inlet of said liquidpump; and a pump discharge conduit communicating between the pressureoutlet of said liquid pump and the motive nozzle of said ejector-venturigas scrubber unit.

3. The extensible wet gas scrubber system of claim 1 wherein valve meansare disposed in drainage conduit of said horizontal settling chamber;the lower section of said horizontal settling chamber being disposed toprovide a storage reservoir for recirculated scrubbing liquid; a liquidpump; a submerged perforated conduit disposed beneath the surface ofsaid liquid reservoir and having exterior ends which penetrate exteriorboundaries of said horizontal settling chamber so that pump suctionconnections may alternately be made to alternate exterior ends of saidsubmerged perforated conduit; and a pump discharge conduit communicatingbetween the pressure outlet of said liquid pump and the motive nozzle ofsaid ejector-venturi gas scrubber unit.

4. Combined air pollution control apparatus for refuse incineratorshaving different ceiling heights and geometry comprising aheight-adjustable wet gas scrubber system having in combination: anelongated plenum comprising a horizontal settling chamber having fluidpassageways therein for horizontal transit with flow reversal of cleanedcombustion gases and for storage of recirculated scrubbing liquid; saidhorizontal settling chamber providing inlet and outlet openings thereonfor connection with inlet and outlet gas conduits; extensible supportlegs having alternate connecting elements and connections with saidhorizontal settling chamber whereby said extensible support members maybe disposed in alternate positions to support the said settling chamberan adjustable distance with respect to the floor; a fluid pumpcomprising an ejector-venturi gas scrubber unit having an integralmotive nozzle disposed to impel the flow of combustion gases throughsaid extensible wet gas scrubber system by means of a high-velocitymotive-jet of scrubbing water;

said ejector-venturi gas scrubber unit substantially supported byconnection with said horizontal settling chamber and disposed todischarge downwardly thereinto; a baffle-type separating elementdisposed within said horizontal settling chamber adjacent the outlet ofsaid ejector-venturi gas scrubber unit to discharge separated liquid andgaseous streams horizontally therefrom; a liquid pump; a pump suctionconduit communicating between the liquid reservoir of said horizontalsettling chamber and the suction inlet of said liquid pump; a pumpdischarge conduit communicating between the pressure outlet of saidliquid pump and the motive nozzle of said ejector-venturi gas scrubberunit; a gas inlet conduit disposed to communicate between a gas outletof a refuse incinerator and the inlet of said ejector-venturi gasscrubber unit, said gas inlet conduit substantially supported byconnection with said ejector-venturi fluid pump; and a gas dischargeconduit disposed to communicate between the gas outlet of saidhorizontal settling chamber and a discharge flue of a refuseincinerator, said gas discharge conduit substantially supported byconnection with said settling chamber; whereby the said horizontalsettling chamber and its extensible support members comprise aheightadjustable foundation for the substantial support of the saidejector-venturi gas scrubber unit and the said inlet and outlet gashandling conduit.

5. The extensible recirculation-type wet gas scrubber system of claim 4whrerein said liquid pump is supported by mountings secured to saidhorizontal settling chamber, thereby providing an integral adjustablefoundation for said liquid pump member.

6. The extensible recirculation-type wet gas scrubber system of claim 4wherein a submerged perforated conduit is disposed beneath the surfaceof said liquid reservoir and having exterior ends which penetrateexterior boundaries of said horizontal settling chamber so that pumpsuction connections may alternately be made to alternate exterior endsof said submerged perforated conduit; and said pump suction conduitbeing disposed to communicate between the suction inlet of said liquidpump and the alternate exterior ends of said submerged perforatedconduit.

7. The extensible wet gas scrubber system of claim 1 wherein a commonmotive-nozzle mounting is disposed centrally within said receivingsection; a plurality of motive nozzles each having different size andliquid capacity at constant supply pressure with respect to each otherand similar means for alternately connecting each nozzle member inoperating position to the said common motive-nozzle mounting, means forsupplying pressurized scrubbing water to any selected individualmotive-nozzle member of the said plurality from a common pressuresource; whereby alternate motive-nozzle members of the said pluralityhaving different liquid capacities may be selectively disposed from thesaid common nozzle mounting in operating position to impel combustiongases through the said ejector-venturi fluid pump at different gas flowrates.

1. Combined air pollution control apparatus for refuse incineratorshaving different ceiling heights and geometry comprising aheight-adjustable wet gas scrubber system having in combination: anelongated plenum comprising a horizontal settling chamber having fluidpassageways therein for horizontal transit with flow reversal of cleanedcombustion gases and proviDing a receptacle for separated scrubbingwater; said horizontal settling chamber providing inlet and outletopenings thereon for connection with inlet and outlet gas conduits;extensible support legs having alternate connecting elements andconnections with said horizontal settling chamber whereby saidextensible support members may be disposed in alternate positions tosupport the said settling chamber an adjustable distance with respect tothe floor; a fluid pump comprising an ejector-venturi gas scrubber unithaving an integral motive nozzle disposed to impel the flow ofcombustion gases through said extensible wet gas scrubber system bymeans of a high-velocity motive-jet of scrubbing water; saidejector-venturi gas scrubber unit substantially supported by connectionwith said horizontal settling chamber and disposed to dischargedownwardly thereinto; a baffle-type separating element disposed withinsaid horizontal settling chamber adjacent the outlet of saidejector-venturi gas scrubber unit to discharge separated liquid andgaseous streams horizontally therefrom; means for supplying pressurizedscrubbing water to the motive nozzle of said ejector-venturi fluid pump;valve means for selectively admitting pressurized scrubbing water intothe water supply conduit of said motive nozzle; a drainage conduitcommunicating with a liquid waste outlet of said horizontal settlingchamber and disposed to discharge separated liquids therefrom; a gasinlet conduit disposed to communicate between the gas outlet of a refuseincinerator and the inlet of said ejector-venturi gas scrubber unit, thesaid gas inlet conduit substantially supported by connection with saidejector-venturi fluid pump; and a gas discharge conduit disposed forcommunication between the gas outlet of said horizontal settling chamberand the discharge flue of a refuse incinerator, said gas dischargeconduit substantially supported by connection with said settlingchamber; whereby the said horizontal settling chamber and its extensiblesupport members comprise a height-adjustable foundation for thesubstantial support of the said ejectorventuri gas scrubber unit and thesaid inlet and outlet gas handling conduit.
 2. The extensible wet gasscrubber system of claim 1 wherein valve means are disposed in drainageconduit of said horizontal settling chamber; the lower section of saidhorizontal settling chamber being disposed to provide a storagereservoir for recirculated scrubbing liquid; a liquid pump; pump suctionconduit communicating between the liquid reservoir of said horizontalsettling chamber and the suction inlet of said liquid pump; and a pumpdischarge conduit communicating between the pressure outlet of saidliquid pump and the motive nozzle of said ejector-venturi gas scrubberunit.
 3. The extensible wet gas scrubber system of claim 1 wherein valvemeans are disposed in drainage conduit of said horizontal settlingchamber; the lower section of said horizontal settling chamber beingdisposed to provide a storage reservoir for recirculated scrubbingliquid; a liquid pump; a submerged perforated conduit disposed beneaththe surface of said liquid reservoir and having exterior ends whichpenetrate exterior boundaries of said horizontal settling chamber sothat pump suction connections may alternately be made to alternateexterior ends of said submerged perforated conduit; and a pump dischargeconduit communicating between the pressure outlet of said liquid pumpand the motive nozzle of said ejector-venturi gas scrubber unit. 4.Combined air pollution control apparatus for refuse incinerators havingdifferent ceiling heights and geometry comprising a height-adjustablewet gas scrubber system having in combination: an elongated plenumcomprising a horizontal settling chamber having fluid passagewaystherein for horizontal transit with flow reversal of cleaned combustiongases and for storage of recirculated scrubbing liquid; said horizontalsettling chamber providing inlet and outlet openings thereon forcOnnection with inlet and outlet gas conduits; extensible support legshaving alternate connecting elements and connections with saidhorizontal settling chamber whereby said extensible support members maybe disposed in alternate positions to support the said settling chamberan adjustable distance with respect to the floor; a fluid pumpcomprising an ejector-venturi gas scrubber unit having an integralmotive nozzle disposed to impel the flow of combustion gases throughsaid extensible wet gas scrubber system by means of a high-velocitymotive-jet of scrubbing water; said ejector-venturi gas scrubber unitsubstantially supported by connection with said horizontal settlingchamber and disposed to discharge downwardly thereinto; a baffle-typeseparating element disposed within said horizontal settling chamberadjacent the outlet of said ejector-venturi gas scrubber unit todischarge separated liquid and gaseous streams horizontally therefrom; aliquid pump; a pump suction conduit communicating between the liquidreservoir of said horizontal settling chamber and the suction inlet ofsaid liquid pump; a pump discharge conduit communicating between thepressure outlet of said liquid pump and the motive nozzle of saidejector-venturi gas scrubber unit; a gas inlet conduit disposed tocommunicate between a gas outlet of a refuse incinerator and the inletof said ejector-venturi gas scrubber unit, said gas inlet conduitsubstantially supported by connection with said ejector-venturi fluidpump; and a gas discharge conduit disposed to communicate between thegas outlet of said horizontal settling chamber and a discharge flue of arefuse incinerator, said gas discharge conduit substantially supportedby connection with said settling chamber; whereby the said horizontalsettling chamber and its extensible support members comprise aheight-adjustable foundation for the substantial support of the saidejector-venturi gas scrubber unit and the said inlet and outlet gashandling conduit.
 5. The extensible recirculation-type wet gas scrubbersystem of claim 4 whrerein said liquid pump is supported by mountingssecured to said horizontal settling chamber, thereby providing anintegral adjustable foundation for said liquid pump member.
 6. Theextensible recirculation-type wet gas scrubber system of claim 4 whereina submerged perforated conduit is disposed beneath the surface of saidliquid reservoir and having exterior ends which penetrate exteriorboundaries of said horizontal settling chamber so that pump suctionconnections may alternately be made to alternate exterior ends of saidsubmerged perforated conduit; and said pump suction conduit beingdisposed to communicate between the suction inlet of said liquid pumpand the alternate exterior ends of said submerged perforated conduit. 7.The extensible wet gas scrubber system of claim 1 wherein a commonmotive-nozzle mounting is disposed centrally within said receivingsection; a plurality of motive nozzles each having different size andliquid capacity at constant supply pressure with respect to each otherand similar means for alternately connecting each nozzle member inoperating position to the said common motive-nozzle mounting, means forsupplying pressurized scrubbing water to any selected individualmotive-nozzle member of the said plurality from a common pressuresource; whereby alternate motive-nozzle members of the said pluralityhaving different liquid capacities may be selectively disposed from thesaid common nozzle mounting in operating position to impel combustiongases through the said ejector-venturi fluid pump at different gas flowrates.